Capacitance Converter

How to use this capacitance conversion calculator

What this calculator does

This tool expresses one electrical capacitance in five common SI-based units: farads, millifarads, microfarads, nanofarads, and picofarads. It is useful when a capacitor datasheet, circuit diagram, parts label, simulation, or measurement instrument uses a different prefix from the one you need. The conversion is an exact decimal identity based on SI prefixes; it does not estimate a capacitor's tolerance, voltage rating, leakage, equivalent series resistance, frequency response, or suitability for a circuit.

When to use it

Use it to compare a component marked in µF with a schematic written in nF, translate a small RF capacitor from pF to nF, normalize a bill of materials to one unit, or check a laboratory reading before entering it into analysis software. The NIST description of SI derived units identifies the farad as the SI unit of capacitance and gives the relation F = C/V.

How to calculate

1. The calculator opens with a complete demonstration: 100 µF, equivalent to 0.1 mF, 0.0001 F, 100,000 nF, and 100,000,000 pF. The example XLSX workbook is available immediately.
2. Choose any one field and replace its value. You can type ordinary decimal notation such as 4.7, 4700, or 0.0000047. Commas, unit symbols, and scientific notation are intentionally rejected so there is no ambiguity.
3. As you type a valid nonnegative value, every other field, result card, summary pill, and table row updates from the same canonical farad value.
4. Read the primary conversion and the five result cards. Use the detail table to verify each SI power-of-ten relationship.
5. Select Download Excel to create a current-state workbook containing the input, conversions, unit factors, and checks. Reset clears the demonstration and all calculated data; Download Excel then remains disabled until you enter a complete valid value again.

Input guide

Capacitance in farads accepts a required nonnegative decimal measured in F; 0.0001 is a realistic example. Increasing it increases every converted value proportionally. Do not paste “F” or use exponent notation. Capacitance in millifarads accepts a nonnegative decimal in mF; 0.1 mF is the startup equivalent. One mF is 10⁻³ F. Capacitance in microfarads accepts a nonnegative decimal in µF; 100 µF is the startup source and is common for electrolytic capacitors. One µF is 10⁻⁶ F. Capacitance in nanofarads accepts a nonnegative decimal in nF; 100,000 nF matches the example. One nF is 10⁻⁹ F. Capacitance in picofarads accepts a nonnegative decimal in pF; 100,000,000 pF is the same example. One pF is 10⁻¹² F. Only one field needs to be edited; the calculator synchronizes the rest. A frequent mistake is confusing lowercase m for milli with uppercase M, or treating µF and nF as interchangeable without the factor of 1,000.

Output guide

Primary conversion shows the last unit you edited and its normalized equivalent in farads. Farads, Millifarads, Microfarads, Nanofarads, and Picofarads are exact equivalent values driven by the same source. The summary pills identify the source unit, base farad value, and the 12-power span from F to pF. The table's Unit and Symbol columns name each unit; Power of ten in farads gives its SI factor; Converted value gives the current number. Zero is a valid physical quantity for the mathematical conversion and produces zero in every unit. Very large values remain valid only while JavaScript can represent every converted result as a finite number.

Worked example

Start with 100 µF. Because micro means 10⁻⁶, multiply 100 by 10⁻⁶ to obtain 0.0001 F. To convert that same farad value to nanofarads, divide by 10⁻⁹: 0.0001 ÷ 10⁻⁹ = 100,000 nF. Dividing by 10⁻¹² gives 100,000,000 pF, while dividing by 10⁻³ gives 0.1 mF. These values match the first-open controls, result cards, table, and workbook. For the official prefix factors, see the NIST metric prefix reference.